( 2.:i ) 



" delicate and fmall, is of great importance ; it is called the liga- 

 " mentum ciliare, becaufeit is compofed of fmall filaments, or fibres, 

 " not unlike the cilia, or eyelafhes ; thefe fibres arife from the 

 " infide of the choroides, all round the circular edge, where it joins 

 " the uvea ; from whence they run upon the fore part of the vitreous 

 " humour, at that place where it divides to cover the cryftalline ; 

 " thofe fibres are at fome diftance from one another, but the inter- 

 '•' ftices are filled up with a dark-coloured mucus, giving ittlie ap- 

 " pearance of a black membrane. 



" Of the Figure reprefenling tie Eye. 



" Figijrc ID, reprel'ents a fe6tion of the ej'e through the middle, 

 *' by an horizontal plane pafiing through boih eyes ; the diameter of 

 " tlie figure is about twice the diameter of the human eye. 



" The outermoil coat, which is caWed/clerotica, is reprefented by 

 ' the ipace between the two exterior circles B F B ; the more glo- 

 " bular part, adjoining to the fclerotica attlie points BB reprefented 

 " by the fpace between the two circles at B A B, is the cornea. 



" The next coat under the fclerotica is a membrane of lefs firm- 

 " nefs, reprefented by the tv/o innermofl: circles of B F B, and called 

 " the choroides. 



" Adjoining to the clioroides, at B B, is a flat membrane, called 

 " the uvea: a a is the pupil, being a fmall hole in the uvea, a little 

 '• nearer tlie nofe than the middle. 



" V the optic nerve ; the fibres of this ner\'e, after their entrance 

 " into the eye, fpread theirifelves over the choroides, forming a thin 

 «•' membrane, called thS retina, and is reprefented in the figure by 

 " the thick Ihade contiguous to the circle B F B. 



'•' E E is the cryjlalline humour ; it is I'ufpended by a jnufcle B b bB, 

 ^' called the ligamentiun ciliare. This mulcle arifes behind tlie uvc^ 

 *\at BB, where the fclerotica and comca join togetlier at bb, it 



